/*
 * Copyright (c) 2011, Nikolaus Moll
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the gradecalculator.net nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package net.gradecalculator.gui.qt.common.layouts;

import com.trolltech.qt.core.QRect;
import com.trolltech.qt.core.QSize;
import com.trolltech.qt.gui.QLayout;
import com.trolltech.qt.gui.QLayoutItemInterface;
import com.trolltech.qt.gui.QWidget;

public class VerySimpleLayout extends QLayout {
	private QLayoutItemInterface item = null;
	private QWidget widget = null;

	public VerySimpleLayout(final QWidget parent) {
		super(parent);
	}

	@Override
	public void setGeometry(final QRect rect) {
		super.setGeometry(rect);
		if (item != null) {
			final QRect clientRect = new QRect(
				parentWidget().contentsMargins().left(),
				parentWidget().contentsMargins().top(),
				rect.width(),
				rect.height());
			widget.setGeometry(clientRect);
		}
	}
	
	public void setWidget(final QWidget widget)
	{
		this.widget = widget;
		addWidget(widget);
	}

	@Override
	public void addItem(final QLayoutItemInterface item) {
		if (this.item != null) {
			throw new IllegalStateException("Only one widget allowed for this layout");
		}

		this.item = item;
	}

	@Override
	public int count() {
		if (item != null) {
			return 1;
		} else {
			return 0;
		}
	}

	@Override
	public QLayoutItemInterface itemAt(final int index) {
		if (index != 0) {
			return null;
		}
		return item;
	}

	@Override
	public QSize sizeHint() {
		if (widget != null) {
			final int marginWidth = parentWidget().contentsMargins().left() + parentWidget().contentsMargins().right();
			final int marginHeight = parentWidget().contentsMargins().top() + parentWidget().contentsMargins().bottom();

			final QSize clientSizeHint = widget.sizeHint();

			final QSize size = new QSize(clientSizeHint.width() + marginWidth, clientSizeHint.height() + marginHeight);
			return size;
		} else {
			return new QSize(0, 0);
		}
	}

	@Override
	public QLayoutItemInterface takeAt(final int index) {
		if (index != 0) {
			return null;
		}
		final QLayoutItemInterface result = item;
		item = null;
		widget = null;
		return result;
	}

}
